2 (x + 5) - x*(x - 10)
(x + 5)^2 - x*(x - 1*10)
25 + 20*x
1*(x + 5/4)
25.0*(1 + 0.2*x)^2 - x*(-10.0 + x)
2 2 (5 + x) - x + 10*x
(5 + x)^2 - x^2 + 10*x